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Open AccessFeature PaperArticle

Implementation of a Single-Phase SST for the Interface between a 13.2 kV MVAC Network and a 750 V Bipolar DC Distribution

1
Department of Electrical Engineering, Pusan National University, Busan 46241, Korea
2
Power Conversion and Control Research Center, HVDC Research Division, KERI, Changwon 51543, Korea
3
Smart Power Distribution Lab, Power Distribution ICT Group, Daejeon 305-760, KEPCO, Korea
*
Author to whom correspondence should be addressed.
Electronics 2018, 7(5), 62; https://doi.org/10.3390/electronics7050062
Received: 12 April 2018 / Revised: 29 April 2018 / Accepted: 30 April 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Renewable Electric Energy Systems)
This paper presents the implementation of a single-phase solid-state transformer (SST) for the interface between a 13.2 kV medium voltage alternative current (MVAC) network and a 750 V bipolar DC distribution. The SST has ten cascaded subunits in consideration of the device rating and modulation index (MI). Each subunit consists of an AC/DC stage and a DC/DC stage with a high frequency isolated transformer (HFIT). The AC/DC stage consists of cascaded H-bridges (CHBs) to cope with the MVAC. The DC/DC stage employs a triple active bridge (TAB) converter for bipolar DC distribution. Topology analysis and controller design for this specific structure are discussed. In addition, the insulation of HFIT used in DC/DC converters is also discussed. A simple balancing controller at the AC/DC stage and a current sharing controller at the DC/DC stage are used to prevent DC-link voltage unbalance caused by the cascaded structure. The discussions are validated using a 150 kW single-phase 21-level SST prototype at the laboratory level. View Full-Text
Keywords: balancing controller; CHB; DAB; SST balancing controller; CHB; DAB; SST
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MDPI and ACS Style

Yun, H.-J.; Jeong, D.-K.; Kim, H.-S.; Kim, M.; Baek, J.-W.; Kim, J.-Y.; Kim, H.-J. Implementation of a Single-Phase SST for the Interface between a 13.2 kV MVAC Network and a 750 V Bipolar DC Distribution. Electronics 2018, 7, 62. https://doi.org/10.3390/electronics7050062

AMA Style

Yun H-J, Jeong D-K, Kim H-S, Kim M, Baek J-W, Kim J-Y, Kim H-J. Implementation of a Single-Phase SST for the Interface between a 13.2 kV MVAC Network and a 750 V Bipolar DC Distribution. Electronics. 2018; 7(5):62. https://doi.org/10.3390/electronics7050062

Chicago/Turabian Style

Yun, Hyeok-Jin; Jeong, Dong-Keun; Kim, Ho-Sung; Kim, Myoungho; Baek, Ju-Won; Kim, Ju-Yong; Kim, Hee-Je. 2018. "Implementation of a Single-Phase SST for the Interface between a 13.2 kV MVAC Network and a 750 V Bipolar DC Distribution" Electronics 7, no. 5: 62. https://doi.org/10.3390/electronics7050062

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